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(Mono C#) Check if Integer Exists at JSON PathDemonstrates how to get an integer value at a JSON path, and how to check to see if it exists.
Chilkat.JsonObject json = new Chilkat.JsonObject(); bool success; // First build simple JSON.. json.UpdateInt("test.abc",100); json.EmitCompact = false; Debug.WriteLine(json.Emit()); // This is our JSON: // { // "test": { // "abc": 100, // } // } string path = "test.notHere"; // The call to IntOf will return 0, because it's not present. // But how do we know if it really was present, and the value was truly 0? int val = json.IntOf(path); Debug.WriteLine("val = " + Convert.ToString(val)); // We cannot use LastMethodSuccess because LastMethodSuccess only applies // to methods that: // - return a string // - return a new Chilkat object, binary bytes, or a date/time. // - returns a boolean status where true = success and false = failed. // - returns an integer where failure is defined by a return value less than zero. // The IntOf method fits none of these requirements, and therefore the LastMethodSuccess // is not a valid indicator.. bool wasFound = json.LastMethodSuccess; Debug.WriteLine("wasFound = " + Convert.ToString(wasFound) + " (not a valid indicator)"); // Instead, if the returned value is 0, we can double-check to see if the member was truly there.. if (val == 0) { wasFound = json.HasMember(path); Debug.WriteLine("wasFound = " + Convert.ToString(wasFound)); if (wasFound == true) { Debug.WriteLine("The value was present and is 0."); } else { Debug.WriteLine("no member is present at test.notHere"); } } else { Debug.WriteLine("val = " + Convert.ToString(val)); } // Alternatively, you could check to see if the member exists beforehand.. if (json.HasMember(path) == true) { Debug.WriteLine("val = " + Convert.ToString(json.IntOf(path))); } else { Debug.WriteLine("no member at " + path); } |
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